url_helper.rb

module UrlHelper

  def with_subdomain(subdomain)
    subdomain = (subdomain || "")
    subdomain += "." unless subdomain.empty?
    [subdomain, request.domain, request.port_string].join
  end

  def url_for(options = nil)
    if options.kind_of?(Hash) && options.has_key?(:subdomain)
      options[:host] = with_subdomain(options.delete(:subdomain))
    end
    if request.subdomain != 'admin'
      language_specific_path(super, I18n.locale)
    else
      super
    end
  end

  def language_specific_path(path, language_code = I18n.locale)
    prefix = path.slice!(/^https?:\/\/[^\/]*/) if path =~ /^https?:\/\//
    prefix ||= ''
    path.slice!(/^\/(en|es)/)
    prefix + if language_code == :en
               path.empty? ? '/' : path
             else
               "/#{language_code}#{path}"
             end
  end

end